nose color

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I've previously owned a silver poodle years ago. But just the last couple of weeks, I've noticed her nose is starting to turn on the edges of the nostrils. It looks brown. At first I thought it was just the lighting or dirt, but it's not and now DH sees it to.
Is this common, rare or what does it mean? In all my family members owning poodles, I've never seen this. Thanks (new here)